A kind of preparation method of ultrafine copper powder for chip multilayer ceramic capacitor
A technology of ultra-fine copper powder and multi-layer ceramics, applied in the field of copper powder for multi-layer ceramic capacitors, can solve the problems of uneven particle size, irregular shape, easy oxidation, etc., and achieve narrow particle size distribution and uniform particle size. Controllable, non-oxidizing effect
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Embodiment 1
[0022] Prepare 102g / L sodium carbonate solution and copper sulfate solution containing 57g / L copper, measure 200mL pure water as the bottom solution, add 0.2g polyethylene glycol, heat the bottom solution to about 50℃, measure 200mL sulfuric acid respectively Copper solution and 350mL sodium carbonate solution are slowly added dropwise into the bottom solution and stirred for reaction. The pH value of the mixed solution is maintained at 8-9, and the rotation speed is 400r / min. After the copper sulfate solution and sodium carbonate solution are added dropwise, the holding time is 1-2h. The temperature is 50-70°C, and the ultra-fine copper powder precursor is prepared. The average particle size of the ultra-fine copper powder precursor is 3.5 μm; the prepared ultra-fine copper powder precursor is washed three times with pure water, and after washing, use 2% BaCl 2 The solution was measured, and there was no white precipitate to prove that the washing was clean; after washing, th...
Embodiment 2
[0024] Prepare 104.3g / L sodium carbonate solution and copper sulfate solution containing 59.2g / L copper, measure 200mL pure water as the bottom solution, add 0.4g polyethylene glycol, heat the bottom solution to about 50°C, measure 400mL of copper sulfate solution and 700mL of sodium carbonate solution were slowly added dropwise into the bottom liquid and stirred for reaction. The pH value of the mixed solution was maintained at 8-9, and the rotation speed was 500r / min. After the copper sulfate solution and sodium carbonate solution were added dropwise, the holding time was 1~ 2h, the temperature is 50 ~ 70 ℃, prepare the ultrafine copper powder precursor, the average particle size of the ultrafine copper powder precursor is 3.4μm; wash the prepared ultrafine copper powder precursor three times with pure water, wash with 2 %BaCl 2 The solution was measured, and no white precipitate proved to be clean; after washing, the ultrafine copper powder precursor was slurried, and 300mL...
Embodiment 3
[0026] Prepare 106g / L sodium carbonate solution and copper sulfate solution containing 62g / L copper, measure 200mL pure water as the bottom solution, add 1.0g polyethylene glycol, heat the bottom solution to about 50℃, measure 2000mL sulfuric acid respectively Copper solution and 4000mL sodium carbonate solution are slowly added dropwise into the bottom solution and stirred for reaction. The pH value of the mixed solution is maintained at 8-9, and the rotation speed is 600r / min. After the copper sulfate solution and sodium carbonate solution are added dropwise, the holding time is 1-2h. The temperature is 50-70°C, and the ultra-fine copper powder precursor is prepared. The average particle size of the ultra-fine copper powder precursor is 4.2 μm; the prepared ultra-fine copper powder precursor is washed three times with pure water, and after washing, use 2% BaCl 2 The solution was tested, and no white precipitate proved to be clean; after washing, the ultrafine copper powder p...
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